diff options
Diffstat (limited to 'src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_conv_partial_opt_q7.c')
| -rw-r--r-- | src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_conv_partial_opt_q7.c | 806 |
1 files changed, 0 insertions, 806 deletions
diff --git a/src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_conv_partial_opt_q7.c b/src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_conv_partial_opt_q7.c deleted file mode 100644 index 513d89d87..000000000 --- a/src/modules/mathlib/CMSIS/DSP_Lib/Source/FilteringFunctions/arm_conv_partial_opt_q7.c +++ /dev/null @@ -1,806 +0,0 @@ -/* ----------------------------------------------------------------------
-* Copyright (C) 2010 ARM Limited. All rights reserved.
-*
-* $Date: 15. February 2012
-* $Revision: V1.1.0
-*
-* Project: CMSIS DSP Library
-* Title: arm_conv_partial_opt_q7.c
-*
-* Description: Partial convolution of Q7 sequences.
-*
-* Target Processor: Cortex-M4/Cortex-M3
-*
-* Version 1.1.0 2012/02/15
-* Updated with more optimizations, bug fixes and minor API changes.
-*
-* Version 1.0.11 2011/10/18
-* Bug Fix in conv, correlation, partial convolution.
-*
-* Version 1.0.10 2011/7/15
-* Big Endian support added and Merged M0 and M3/M4 Source code.
-*
-* Version 1.0.3 2010/11/29
-* Re-organized the CMSIS folders and updated documentation.
-*
-* Version 1.0.2 2010/11/11
-* Documentation updated.
-*
-* Version 1.0.1 2010/10/05
-* Production release and review comments incorporated.
-*
-* Version 1.0.0 2010/09/20
-* Production release and review comments incorporated
-*
-* Version 0.0.7 2010/06/10
-* Misra-C changes done
-*
-* -------------------------------------------------------------------- */
-
-#include "arm_math.h"
-
-/**
- * @ingroup groupFilters
- */
-
-/**
- * @addtogroup PartialConv
- * @{
- */
-
-/**
- * @brief Partial convolution of Q7 sequences.
- * @param[in] *pSrcA points to the first input sequence.
- * @param[in] srcALen length of the first input sequence.
- * @param[in] *pSrcB points to the second input sequence.
- * @param[in] srcBLen length of the second input sequence.
- * @param[out] *pDst points to the location where the output result is written.
- * @param[in] firstIndex is the first output sample to start with.
- * @param[in] numPoints is the number of output points to be computed.
- * @param[in] *pScratch1 points to scratch buffer(of type q15_t) of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2.
- * @param[in] *pScratch2 points to scratch buffer (of type q15_t) of size min(srcALen, srcBLen).
- * @return Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].
- *
- * \par Restrictions
- * If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE
- * In this case input, output, scratch1 and scratch2 buffers should be aligned by 32-bit
- *
- *
- *
- */
-
-
-#ifndef UNALIGNED_SUPPORT_DISABLE
-
-arm_status arm_conv_partial_opt_q7(
- q7_t * pSrcA,
- uint32_t srcALen,
- q7_t * pSrcB,
- uint32_t srcBLen,
- q7_t * pDst,
- uint32_t firstIndex,
- uint32_t numPoints,
- q15_t * pScratch1,
- q15_t * pScratch2)
-{
-
- q15_t *pScr2, *pScr1; /* Intermediate pointers for scratch pointers */
- q15_t x4; /* Temporary input variable */
- q7_t *pIn1, *pIn2; /* inputA and inputB pointer */
- uint32_t j, k, blkCnt, tapCnt; /* loop counter */
- q7_t *px; /* Temporary input1 pointer */
- q15_t *py; /* Temporary input2 pointer */
- q31_t acc0, acc1, acc2, acc3; /* Accumulator */
- q31_t x1, x2, x3, y1; /* Temporary input variables */
- arm_status status;
- q7_t *pOut = pDst; /* output pointer */
- q7_t out0, out1, out2, out3; /* temporary variables */
-
- /* Check for range of output samples to be calculated */
- if((firstIndex + numPoints) > ((srcALen + (srcBLen - 1u))))
- {
- /* Set status as ARM_MATH_ARGUMENT_ERROR */
- status = ARM_MATH_ARGUMENT_ERROR;
- }
- else
- {
-
- /* The algorithm implementation is based on the lengths of the inputs. */
- /* srcB is always made to slide across srcA. */
- /* So srcBLen is always considered as shorter or equal to srcALen */
- if(srcALen >= srcBLen)
- {
- /* Initialization of inputA pointer */
- pIn1 = pSrcA;
-
- /* Initialization of inputB pointer */
- pIn2 = pSrcB;
- }
- else
- {
- /* Initialization of inputA pointer */
- pIn1 = pSrcB;
-
- /* Initialization of inputB pointer */
- pIn2 = pSrcA;
-
- /* srcBLen is always considered as shorter or equal to srcALen */
- j = srcBLen;
- srcBLen = srcALen;
- srcALen = j;
- }
-
- /* pointer to take end of scratch2 buffer */
- pScr2 = pScratch2;
-
- /* points to smaller length sequence */
- px = pIn2 + srcBLen - 1;
-
- /* Apply loop unrolling and do 4 Copies simultaneously. */
- k = srcBLen >> 2u;
-
- /* First part of the processing with loop unrolling copies 4 data points at a time.
- ** a second loop below copies for the remaining 1 to 3 samples. */
- while(k > 0u)
- {
- /* copy second buffer in reversal manner */
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* If the count is not a multiple of 4, copy remaining samples here.
- ** No loop unrolling is used. */
- k = srcBLen % 0x4u;
-
- while(k > 0u)
- {
- /* copy second buffer in reversal manner for remaining samples */
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* Initialze temporary scratch pointer */
- pScr1 = pScratch1;
-
- /* Fill (srcBLen - 1u) zeros in scratch buffer */
- arm_fill_q15(0, pScr1, (srcBLen - 1u));
-
- /* Update temporary scratch pointer */
- pScr1 += (srcBLen - 1u);
-
- /* Copy (srcALen) samples in scratch buffer */
- /* Apply loop unrolling and do 4 Copies simultaneously. */
- k = srcALen >> 2u;
-
- /* First part of the processing with loop unrolling copies 4 data points at a time.
- ** a second loop below copies for the remaining 1 to 3 samples. */
- while(k > 0u)
- {
- /* copy second buffer in reversal manner */
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* If the count is not a multiple of 4, copy remaining samples here.
- ** No loop unrolling is used. */
- k = srcALen % 0x4u;
-
- while(k > 0u)
- {
- /* copy second buffer in reversal manner for remaining samples */
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* Fill (srcBLen - 1u) zeros at end of scratch buffer */
- arm_fill_q15(0, pScr1, (srcBLen - 1u));
-
- /* Update pointer */
- pScr1 += (srcBLen - 1u);
-
-
- /* Temporary pointer for scratch2 */
- py = pScratch2;
-
- /* Initialization of pIn2 pointer */
- pIn2 = (q7_t *) py;
-
- pScr2 = py;
-
- pOut = pDst + firstIndex;
-
- pScratch1 += firstIndex;
-
- /* Actual convolution process starts here */
- blkCnt = (numPoints) >> 2;
-
-
- while(blkCnt > 0)
- {
- /* Initialze temporary scratch pointer as scratch1 */
- pScr1 = pScratch1;
-
- /* Clear Accumlators */
- acc0 = 0;
- acc1 = 0;
- acc2 = 0;
- acc3 = 0;
-
- /* Read two samples from scratch1 buffer */
- x1 = *__SIMD32(pScr1)++;
-
- /* Read next two samples from scratch1 buffer */
- x2 = *__SIMD32(pScr1)++;
-
- tapCnt = (srcBLen) >> 2u;
-
- while(tapCnt > 0u)
- {
-
- /* Read four samples from smaller buffer */
- y1 = _SIMD32_OFFSET(pScr2);
-
- /* multiply and accumlate */
- acc0 = __SMLAD(x1, y1, acc0);
- acc2 = __SMLAD(x2, y1, acc2);
-
- /* pack input data */
-#ifndef ARM_MATH_BIG_ENDIAN
- x3 = __PKHBT(x2, x1, 0);
-#else
- x3 = __PKHBT(x1, x2, 0);
-#endif
-
- /* multiply and accumlate */
- acc1 = __SMLADX(x3, y1, acc1);
-
- /* Read next two samples from scratch1 buffer */
- x1 = *__SIMD32(pScr1)++;
-
- /* pack input data */
-#ifndef ARM_MATH_BIG_ENDIAN
- x3 = __PKHBT(x1, x2, 0);
-#else
- x3 = __PKHBT(x2, x1, 0);
-#endif
-
- acc3 = __SMLADX(x3, y1, acc3);
-
- /* Read four samples from smaller buffer */
- y1 = _SIMD32_OFFSET(pScr2 + 2u);
-
- acc0 = __SMLAD(x2, y1, acc0);
-
- acc2 = __SMLAD(x1, y1, acc2);
-
- acc1 = __SMLADX(x3, y1, acc1);
-
- x2 = *__SIMD32(pScr1)++;
-
-#ifndef ARM_MATH_BIG_ENDIAN
- x3 = __PKHBT(x2, x1, 0);
-#else
- x3 = __PKHBT(x1, x2, 0);
-#endif
-
- acc3 = __SMLADX(x3, y1, acc3);
-
- pScr2 += 4u;
-
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
-
-
- /* Update scratch pointer for remaining samples of smaller length sequence */
- pScr1 -= 4u;
-
-
- /* apply same above for remaining samples of smaller length sequence */
- tapCnt = (srcBLen) & 3u;
-
- while(tapCnt > 0u)
- {
-
- /* accumlate the results */
- acc0 += (*pScr1++ * *pScr2);
- acc1 += (*pScr1++ * *pScr2);
- acc2 += (*pScr1++ * *pScr2);
- acc3 += (*pScr1++ * *pScr2++);
-
- pScr1 -= 3u;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- blkCnt--;
-
- /* Store the result in the accumulator in the destination buffer. */
- out0 = (q7_t) (__SSAT(acc0 >> 7u, 8));
- out1 = (q7_t) (__SSAT(acc1 >> 7u, 8));
- out2 = (q7_t) (__SSAT(acc2 >> 7u, 8));
- out3 = (q7_t) (__SSAT(acc3 >> 7u, 8));
-
- *__SIMD32(pOut)++ = __PACKq7(out0, out1, out2, out3);
-
- /* Initialization of inputB pointer */
- pScr2 = py;
-
- pScratch1 += 4u;
-
- }
-
- blkCnt = (numPoints) & 0x3;
-
- /* Calculate convolution for remaining samples of Bigger length sequence */
- while(blkCnt > 0)
- {
- /* Initialze temporary scratch pointer as scratch1 */
- pScr1 = pScratch1;
-
- /* Clear Accumlators */
- acc0 = 0;
-
- tapCnt = (srcBLen) >> 1u;
-
- while(tapCnt > 0u)
- {
-
- /* Read next two samples from scratch1 buffer */
- x1 = *__SIMD32(pScr1)++;
-
- /* Read two samples from smaller buffer */
- y1 = *__SIMD32(pScr2)++;
-
- acc0 = __SMLAD(x1, y1, acc0);
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- tapCnt = (srcBLen) & 1u;
-
- /* apply same above for remaining samples of smaller length sequence */
- while(tapCnt > 0u)
- {
-
- /* accumlate the results */
- acc0 += (*pScr1++ * *pScr2++);
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- blkCnt--;
-
- /* Store the result in the accumulator in the destination buffer. */
- *pOut++ = (q7_t) (__SSAT(acc0 >> 7u, 8));
-
- /* Initialization of inputB pointer */
- pScr2 = py;
-
- pScratch1 += 1u;
-
- }
-
- /* set status as ARM_MATH_SUCCESS */
- status = ARM_MATH_SUCCESS;
-
-
- }
-
- return (status);
-
-}
-
-#else
-
-arm_status arm_conv_partial_opt_q7(
- q7_t * pSrcA,
- uint32_t srcALen,
- q7_t * pSrcB,
- uint32_t srcBLen,
- q7_t * pDst,
- uint32_t firstIndex,
- uint32_t numPoints,
- q15_t * pScratch1,
- q15_t * pScratch2)
-{
-
- q15_t *pScr2, *pScr1; /* Intermediate pointers for scratch pointers */
- q15_t x4; /* Temporary input variable */
- q7_t *pIn1, *pIn2; /* inputA and inputB pointer */
- uint32_t j, k, blkCnt, tapCnt; /* loop counter */
- q7_t *px; /* Temporary input1 pointer */
- q15_t *py; /* Temporary input2 pointer */
- q31_t acc0, acc1, acc2, acc3; /* Accumulator */
- arm_status status;
- q7_t *pOut = pDst; /* output pointer */
- q15_t x10, x11, x20, x21; /* Temporary input variables */
- q15_t y10, y11; /* Temporary input variables */
- q7_t out0, out1, out2, out3; /* temporary variables */
-
- /* Check for range of output samples to be calculated */
- if((firstIndex + numPoints) > ((srcALen + (srcBLen - 1u))))
- {
- /* Set status as ARM_MATH_ARGUMENT_ERROR */
- status = ARM_MATH_ARGUMENT_ERROR;
- }
- else
- {
-
- /* The algorithm implementation is based on the lengths of the inputs. */
- /* srcB is always made to slide across srcA. */
- /* So srcBLen is always considered as shorter or equal to srcALen */
- if(srcALen >= srcBLen)
- {
- /* Initialization of inputA pointer */
- pIn1 = pSrcA;
-
- /* Initialization of inputB pointer */
- pIn2 = pSrcB;
- }
- else
- {
- /* Initialization of inputA pointer */
- pIn1 = pSrcB;
-
- /* Initialization of inputB pointer */
- pIn2 = pSrcA;
-
- /* srcBLen is always considered as shorter or equal to srcALen */
- j = srcBLen;
- srcBLen = srcALen;
- srcALen = j;
- }
-
- /* pointer to take end of scratch2 buffer */
- pScr2 = pScratch2;
-
- /* points to smaller length sequence */
- px = pIn2 + srcBLen - 1;
-
- /* Apply loop unrolling and do 4 Copies simultaneously. */
- k = srcBLen >> 2u;
-
- /* First part of the processing with loop unrolling copies 4 data points at a time.
- ** a second loop below copies for the remaining 1 to 3 samples. */
- while(k > 0u)
- {
- /* copy second buffer in reversal manner */
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* If the count is not a multiple of 4, copy remaining samples here.
- ** No loop unrolling is used. */
- k = srcBLen % 0x4u;
-
- while(k > 0u)
- {
- /* copy second buffer in reversal manner for remaining samples */
- x4 = (q15_t) * px--;
- *pScr2++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* Initialze temporary scratch pointer */
- pScr1 = pScratch1;
-
- /* Fill (srcBLen - 1u) zeros in scratch buffer */
- arm_fill_q15(0, pScr1, (srcBLen - 1u));
-
- /* Update temporary scratch pointer */
- pScr1 += (srcBLen - 1u);
-
- /* Copy (srcALen) samples in scratch buffer */
- /* Apply loop unrolling and do 4 Copies simultaneously. */
- k = srcALen >> 2u;
-
- /* First part of the processing with loop unrolling copies 4 data points at a time.
- ** a second loop below copies for the remaining 1 to 3 samples. */
- while(k > 0u)
- {
- /* copy second buffer in reversal manner */
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* If the count is not a multiple of 4, copy remaining samples here.
- ** No loop unrolling is used. */
- k = srcALen % 0x4u;
-
- while(k > 0u)
- {
- /* copy second buffer in reversal manner for remaining samples */
- x4 = (q15_t) * pIn1++;
- *pScr1++ = x4;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* Apply loop unrolling and do 4 Copies simultaneously. */
- k = (srcBLen - 1u) >> 2u;
-
- /* First part of the processing with loop unrolling copies 4 data points at a time.
- ** a second loop below copies for the remaining 1 to 3 samples. */
- while(k > 0u)
- {
- /* copy second buffer in reversal manner */
- *pScr1++ = 0;
- *pScr1++ = 0;
- *pScr1++ = 0;
- *pScr1++ = 0;
-
- /* Decrement the loop counter */
- k--;
- }
-
- /* If the count is not a multiple of 4, copy remaining samples here.
- ** No loop unrolling is used. */
- k = (srcBLen - 1u) % 0x4u;
-
- while(k > 0u)
- {
- /* copy second buffer in reversal manner for remaining samples */
- *pScr1++ = 0;
-
- /* Decrement the loop counter */
- k--;
- }
-
-
- /* Temporary pointer for scratch2 */
- py = pScratch2;
-
- /* Initialization of pIn2 pointer */
- pIn2 = (q7_t *) py;
-
- pScr2 = py;
-
- pOut = pDst + firstIndex;
-
- pScratch1 += firstIndex;
-
- /* Actual convolution process starts here */
- blkCnt = (numPoints) >> 2;
-
-
- while(blkCnt > 0)
- {
- /* Initialze temporary scratch pointer as scratch1 */
- pScr1 = pScratch1;
-
- /* Clear Accumlators */
- acc0 = 0;
- acc1 = 0;
- acc2 = 0;
- acc3 = 0;
-
- /* Read two samples from scratch1 buffer */
- x10 = *pScr1++;
- x11 = *pScr1++;
-
- /* Read next two samples from scratch1 buffer */
- x20 = *pScr1++;
- x21 = *pScr1++;
-
- tapCnt = (srcBLen) >> 2u;
-
- while(tapCnt > 0u)
- {
-
- /* Read four samples from smaller buffer */
- y10 = *pScr2;
- y11 = *(pScr2 + 1u);
-
- /* multiply and accumlate */
- acc0 += (q31_t) x10 *y10;
- acc0 += (q31_t) x11 *y11;
- acc2 += (q31_t) x20 *y10;
- acc2 += (q31_t) x21 *y11;
-
-
- acc1 += (q31_t) x11 *y10;
- acc1 += (q31_t) x20 *y11;
-
- /* Read next two samples from scratch1 buffer */
- x10 = *pScr1;
- x11 = *(pScr1 + 1u);
-
- /* multiply and accumlate */
- acc3 += (q31_t) x21 *y10;
- acc3 += (q31_t) x10 *y11;
-
- /* Read next two samples from scratch2 buffer */
- y10 = *(pScr2 + 2u);
- y11 = *(pScr2 + 3u);
-
- /* multiply and accumlate */
- acc0 += (q31_t) x20 *y10;
- acc0 += (q31_t) x21 *y11;
- acc2 += (q31_t) x10 *y10;
- acc2 += (q31_t) x11 *y11;
- acc1 += (q31_t) x21 *y10;
- acc1 += (q31_t) x10 *y11;
-
- /* Read next two samples from scratch1 buffer */
- x20 = *(pScr1 + 2);
- x21 = *(pScr1 + 3);
-
- /* multiply and accumlate */
- acc3 += (q31_t) x11 *y10;
- acc3 += (q31_t) x20 *y11;
-
- /* update scratch pointers */
-
- pScr1 += 4u;
- pScr2 += 4u;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
-
-
- /* Update scratch pointer for remaining samples of smaller length sequence */
- pScr1 -= 4u;
-
-
- /* apply same above for remaining samples of smaller length sequence */
- tapCnt = (srcBLen) & 3u;
-
- while(tapCnt > 0u)
- {
-
- /* accumlate the results */
- acc0 += (*pScr1++ * *pScr2);
- acc1 += (*pScr1++ * *pScr2);
- acc2 += (*pScr1++ * *pScr2);
- acc3 += (*pScr1++ * *pScr2++);
-
- pScr1 -= 3u;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- blkCnt--;
-
- /* Store the result in the accumulator in the destination buffer. */
- out0 = (q7_t) (__SSAT(acc0 >> 7u, 8));
- out1 = (q7_t) (__SSAT(acc1 >> 7u, 8));
- out2 = (q7_t) (__SSAT(acc2 >> 7u, 8));
- out3 = (q7_t) (__SSAT(acc3 >> 7u, 8));
-
-
- *__SIMD32(pOut)++ = __PACKq7(out0, out1, out2, out3);
-
- /* Initialization of inputB pointer */
- pScr2 = py;
-
- pScratch1 += 4u;
-
- }
-
- blkCnt = (numPoints) & 0x3;
-
- /* Calculate convolution for remaining samples of Bigger length sequence */
- while(blkCnt > 0)
- {
- /* Initialze temporary scratch pointer as scratch1 */
- pScr1 = pScratch1;
-
- /* Clear Accumlators */
- acc0 = 0;
-
- tapCnt = (srcBLen) >> 1u;
-
- while(tapCnt > 0u)
- {
-
- /* Read next two samples from scratch1 buffer */
- x10 = *pScr1++;
- x11 = *pScr1++;
-
- /* Read two samples from smaller buffer */
- y10 = *pScr2++;
- y11 = *pScr2++;
-
- /* multiply and accumlate */
- acc0 += (q31_t) x10 *y10;
- acc0 += (q31_t) x11 *y11;
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- tapCnt = (srcBLen) & 1u;
-
- /* apply same above for remaining samples of smaller length sequence */
- while(tapCnt > 0u)
- {
-
- /* accumlate the results */
- acc0 += (*pScr1++ * *pScr2++);
-
- /* Decrement the loop counter */
- tapCnt--;
- }
-
- blkCnt--;
-
- /* Store the result in the accumulator in the destination buffer. */
- *pOut++ = (q7_t) (__SSAT(acc0 >> 7u, 8));
-
- /* Initialization of inputB pointer */
- pScr2 = py;
-
- pScratch1 += 1u;
-
- }
-
- /* set status as ARM_MATH_SUCCESS */
- status = ARM_MATH_SUCCESS;
-
- }
-
- return (status);
-
-}
-
-#endif /* #ifndef UNALIGNED_SUPPORT_DISABLE */
-
-
-
-/**
- * @} end of PartialConv group
- */
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